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// Copyright (c) 2014 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// as of Go 1.8 this requires the goyacc external tool
// available from golang.org/x/tools/cmd/goyacc
//go:generate goyacc -o query_string.y.go query_string.y
//go:generate sed -i.tmp -e 1d query_string.y.go
//go:generate rm query_string.y.go.tmp
// note: OSX sed and gnu sed handle the -i (in-place) option differently.
// using -i.tmp works on both, at the expense of having to remove
// the unsightly .tmp files
package query
import (
"fmt"
"strings"
)
var debugParser bool
var debugLexer bool
func parseQuerySyntax(query string) (rq Query, err error) {
if query == "" {
return NewMatchNoneQuery(), nil
}
lex := newLexerWrapper(newQueryStringLex(strings.NewReader(query)))
doParse(lex)
if len(lex.errs) > 0 {
return nil, fmt.Errorf(strings.Join(lex.errs, "\n"))
}
return lex.query, nil
}
func doParse(lex *lexerWrapper) {
defer func() {
r := recover()
if r != nil {
lex.errs = append(lex.errs, fmt.Sprintf("parse error: %v", r))
}
}()
yyParse(lex)
}
const (
queryShould = iota
queryMust
queryMustNot
)
type lexerWrapper struct {
lex yyLexer
errs []string
query *BooleanQuery
}
func newLexerWrapper(lex yyLexer) *lexerWrapper {
return &lexerWrapper{
lex: lex,
query: NewBooleanQueryForQueryString(nil, nil, nil),
}
}
func (l *lexerWrapper) Lex(lval *yySymType) int {
return l.lex.Lex(lval)
}
func (l *lexerWrapper) Error(s string) {
l.errs = append(l.errs, s)
}
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